166287317542 has 4 divisors (see below), whose sum is σ = 249430976316. Its totient is φ = 83143658770.

The previous prime is 166287317519. The next prime is 166287317561. The reversal of 166287317542 is 245713782661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245713782661 = 919 ⋅267370819.

It is a self number, because there is not a number n which added to its sum of digits gives 166287317542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41571829384 + ... + 41571829387.

It is an arithmetic number, because the mean of its divisors is an integer number (62357744079).

Almost surely, 2^166287317542 is an apocalyptic number.

166287317542 is a deficient number, since it is larger than the sum of its proper divisors (83143658774).

166287317542 is an equidigital number, since it uses as much as digits as its factorization.

166287317542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83143658773.

The product of its digits is 3386880, while the sum is 52.

The spelling of 166287317542 in words is "one hundred sixty-six billion, two hundred eighty-seven million, three hundred seventeen thousand, five hundred forty-two".